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The oven just stopped working. No power, no display on console. Changed one fuse (15 amp ceramic fuse). Power came

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Old 12-18-2007, 04:00 PM
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Default Microwave Convection Oven
Model Number: JVM290   Brand: GE   Age: 5 - 10 years   

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The oven just stopped working. No power, no display on console. Changed one fuse (15 amp ceramic fuse). Power came back on but as soon as I pushed button to heat, the fuse is blown again. What is the next step? Thank you for your help.


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  #2 (permalink)  
Old 12-19-2007, 02:54 AM
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Quote:
Originally Posted by bc9ltjj View Post
The oven just stopped working. No power, no display on console. Changed one fuse (15 amp ceramic fuse). Power came back on but as soon as I pushed button to heat, the fuse is blown again. What is the next step? Thank you for your help.
If it blows as soon as you hit Start, that's almost always a shorted high-voltage capacitor.

You can buy parts and find helpful exploded views here: Appliance Parts Pros.com Discount Appliance Parts – Appliance Repair Parts

There is also a mini-manual hidden behind the control panel inside.

For critical microwave safety & disassembly tips, see all Microwave Display Repair Sharp Dacor GE General Electric & all Microwave Display Repair Sharp Dacor GE General Electric
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Old 12-19-2007, 05:17 AM
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should use a multimeter to check HV Cap and also ohm out the mag tube as a short in the mag tub will do the same ...
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Old 12-19-2007, 07:30 AM
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Thank you for your reply. I am a novice in electronics so I am not quite sure what I need to do to test. Do I need to remove the unit from the wall to do the testing or to replace the parts? MicrowaveDisplaycom seems quite sure the problem is from HV capacitor. If so, is this a good bet to replace it and see if it corrects the problem? What I mean, what is the chance of Mag tube being defective?
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Old 01-03-2008, 09:45 AM
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Default GE JVM1339BW002 Blows Fuse

I have a very similar problem. When I push the start button, the fuse blows as soon as it begins to draw high power, which is about 2 seconds after I push start. I have a multimeter, but not exaclty sure how to test the capacitor. Once I remove the two leads and touch the multimeter leads to the capacitor, what am I looking for to determine if it is bad? The microwave is about 10 yrs old.

Pete
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Old 12-10-2008, 08:40 PM
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Check monitor sw which is NC if faulty replace. If ok change Mag/diode.
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Old 12-10-2008, 08:44 PM
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Check monitor sw which is NC if faulty replace. If ok change Mag/diode. And by the way disregard the other persons comment about chking the CAP you hardly ever need to change. The cap. is a Hi-voltage piece be sure you discharge it correctly or it can really hurt. (40,000 vlts)
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Old 12-10-2008, 08:44 PM
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Default Just a quick note

Check monitor sw which is NC if faulty replace. If ok change Mag/diode. And by the way disregard the other persons comment about chking the CAP you hardly ever need to change. The cap. is a Hi-voltage piece be sure you discharge it correctly or it can really hurt. (40,000 vlts)
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Old 12-11-2008, 03:31 AM
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Yes, yes, a magnetron, if shorted from filament to case, will do that too, but it's pretty rare.

It's almost certainly the capacitor.

Here are some links for testing HV parts, in the order I'd suspect them in this situation but please read the safety info, which also has a link to shorting the capacitor:

How to Test The High Voltage Capacitor Used In Microwave Ovens

The Purpose of the Typical High Voltage Transformer Used in Microwave Ovens and How to Safely Test It

How To Test The Magnetron Used In Microwave Ovens

How to Test The High-Voltage Diode (Rectifier) Used In Microwave Ovens (if it is NOT shorted, it's probably fine - a shorted diode will not blow the fuse - I just threw this in FYI).

P.S.

And by the way disregard the other persons who say the high voltage cap has 40,000 volts on it. Good God... It's actually about 4000 volts.

And it's not at all uncommon for caps to short. Ask anybody who works on Panasonics a lot!

Always test a part - don't just guess at it like some folks would suggest!
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Old 12-11-2008, 08:05 AM
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agdixx, you don't sound very familiar with how a microwave works. Yes a monitor switch will cause a fuse to blow, but a bad monitor switch will blow a fuse when you close the door.....In rare cases a magtube can blow a fuse, but in my 10 years I have yet to see a magtube do this... After 2 seconds of hitting start that is when the high voltage side of the Microwave is activated, a shorted capacitor (which is not that rare) will kill the fuse as soon as the high voltage side is activated...2-3 seconds from hitting start. The transformer if shorted will trip the house breaker A BAD CAP WILL BLOW THE FUSE and is NOT that rare. Most the time after 2 seconds of start up, a bad cap will make a loud buzz just prior to the fuse going out.
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